Book Extreme Ownership is a book about military leadership. Authors talk from their own experience, which they acquired in SEAL training both as instructors and candidates, and in Iraqi War as fighting soldiers. In book, military leader has the essential role. Military leader learns the tools, which he needs for leadership through 12 principles, described in the book. Responsibility is the foundation of leadership. This responsibility firstly begins within the leader himself, it continious with the responsibility for his or hers actions and decisions, responsibility for his or hers subordinates and team as whole, and lastly, responsibility for a mission – responsibility for success or failure. Leadership in this books means total responsibility and ownership of leader, team and mission as whole. Concepts are easy, but hard to use. They require that a person leaves his or hers ego aside, becomes aware of the reality and environment and does everything he or she can, in order to win. Principles from this book are not unique, but they are presented in an extremely realistic and brutal way, which differs from other similar manuals.